Temperature compensated regulator (CB8692E)

This circuit was found in a 1965 Electronics Design. The configuration can be applied to current circuits with modern equivalent transistors.

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Infrared controlled soldering station (CB7021E)
This circuit was found in 80's Popular Electronics. The circuit uses an infrared-sensitive phototransistor...
Charge and Discharge Monitor (CB5408E)
Supplied in a 2005 Linear Technology Application Manual, this circuit monitors the charge and...
Null Detector (CB5071E)
We found this circuit in an American 1980s documentation. Transistors may be general purpose...